Dust recovery device



sept. 29, 1931. v. G. LEACH L 1,825,274 l DUST RECOVERY DEVICE Filed Dec. 5, 1930 Patented Sept. 29, 1931 UNITED STATES infrEN'r OFFICE VERNON G, LEACH, OF CHICAGO, ILLINOIS, ASSIGNOR 'O MODERN COAL BURNER COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS DUST RECOVERY DEVICE Application led December 5, 1930. Serial No. 500,197.

My invention relates to a devicefor separating solid particles from gases, and more particularly to a device for separating. entrained dust, cinders andthe like from iue gases.

Heretofore, such separators have been so constructed that the gases are passed through a tortuous passageway and the gases in changing their direction eliminate any heavier particles carried thereby, which may then drop into a receptacle located underneath the' p-assageway and into which the passageway opens.

Such eliminators are objectionable in that, although there is a slight change-in "direction of the gases there is no such change as will cause substantially all the particles to leave the gaseous fluid. Further, there is a great tendency for the dust laden gases to hug the outside contours of the bales and follow sinuous paths through the passageway, thereby passing through the eliminator without being acted upon.

It is an object of my invention to provide a dust separator which is simple in construction and positive in action.

It is a further object of my invention to provide a dust separator in which there are a number of baiiies so arranged that substantially the entire flow of gases is sub- 'ected to changes in direction of at least 90 and in which the changes in direction of flow of a considerable volume of the gases are vnot only effected in a horizontal plane but also in a vertical plane.

It is a still further object of my invention to provide in a dust separator staggered baflies having plane parallel sides, whereby an waills thereof and pass through4 without being acted upon by such separator is minimized.

These and other objects of my invention will be apparent from the following description and appended claims. t

My invention (in a preferred form) is described in the following specification and in the drawings which form a part thereof.

n the drawings:

' lFigure 1 1s a tendency of the gases-to hug the outer.

longitudinal cross section showing my separator located in a flue.

Figure 2 is a sectional View taken on the line II-.II of Figure 1.

As shown on the drawings: In the drawings the numeral 1 indicates a conduit or flue such as is used to connectA va furnace with a smokestack. A number of rows 2, 3 and 4 of baffles 5 are located in the flue and extend from the top thereof to the bottom. Each row comprises a number of baffles 5 which are U-shaped and have vertical, plane side-walls 6 and 7.l Openings 9 at the lower ends of the bales 5 extend through the bottom 10 of the Hue and give entrance to a hopper-shaped receptacle 11 into which the dust particles are diverted. The open front 8 of the baffles faces the incoming flow of gases. The baiies are spaced apart in each row and are so arranged that the baliies in one row face the spaces in the next preceding row. This staggered arrangement of the baflies causes Isubstantially the whole volume of the gases to be diverted and thereby eliminates the contained dust particles.

The hopper-shaped receptacle 11 has an opening 12 in the bottom thereof normally closed by the slide 12a through which the accumulated particles may be discharged.

A row 13 of relatively. larger elongated baiies 14 is located in the iiue directly behind the row 4 of baffles 5. These baies 14 rovide elongated openings 15 in the flow o the gas whichI are narrower than the openings 8 in the other baies. Openings 16 through the bottom of the flue and aligned with the bailes. 14 serve for the re-entry into said flue of the gases which have been diverted along with the dust particles to the hopper 11. The baies 14 are each located! directly behind a baffle of the precedingvrow so'as to eliminate any tendency of the gases to flow from the flue through the battles 14 into the hopper 11.

The dust laden gases How through-the flue in the direction of the arrows. A considerable volume of such gases enters the battles of row 2 and undergoes a change in ried into the hopper along with the dust par! ticles. This volume of gases re-enters the flue through the baffles 14.vr In changing direction in the hopper and again in the baiies 14, these gases eliminate all particles which tend to become entrainedv therein. It will be seen that the gases undergo three stages of dust elimination. In the baffies ofy rows 2, 3 and 4, a large volume of gas is acted upon diverting a great amount of dust particles and a small amountofgas to the receptacle. In the latter this small amount of gas together with the relatively great amount of contained matter undergoes another change in direction whereby the particles drop by gravity to the bottom of the receptacle. The gas in leaving the receptacle goes through the elongated openings 15 and any particles which might still be entrained in the gas are dropped back into the receptacle.

It will thus be seen that my novel separator, as described, provides an advantageous and positive means of separting heavier p particles from the gases passed through the `Hue 1. The Iarrangement of the bailies and proportioning of areas of the openings associated therewith are such that no subsantial resistance to the flow of flue gases is offered by the dust separator of my invention.

While I have described a preferred embodiment of my invention, I do not wish to be limited thereto, as I am aware that many changes may be madein the details r of construction and arrangement of parts without departing from the spirit and scope of my invention.

I claim as my invention:

1. In a device of the class described, in combination a fluid conduit, a chamber located below said conduit, a series of U-shaped baiiles having plane sides arranged in staggered relation in said conduit, said baffles extending from the top of the conduit to the bottom thereof, the bottom of said conduit being provided with openings aligned with said bailes for communication with said chamber and communicating means comprising another series of bafHcs having openings in' the bottom thereof to allow the flow of the fluid from said chamber back into said conduit.

.2. A recovery device for separating partlcles from a fluid, comprising a conduit having a series of openings in staggered arrangement in the bottom thereof, a'hopper-shaped chamber located below said conduit, a series of bales in said conduit for directing the fiuid to said chamber through said openings, said baffles having plane vertical walls parallel to the direction of low to diminish the tendency of the fluid to follow along the outer sides thereof, a second series of baHes located in said conduit beyond said first series and having communication with said chamber for providing a re-entry for the gases into said conduit.

3. In a device of the class described, in Combination a-iiuid conduit, a chamber located below said conduit, a series of rows of U-shaped bales in said conduit, said baffles being spaced apart in said rows, the ba-iies in each row being aligned with the spaces between the baffles in the next preceding row, said baties having plane sides extending from the top of said conduit to the bottom thereof, the bottom of said conduit being provided with openings located in' said baliles for communication with said )chamber and communication means comprising another series of bailles having bottom of said conduit being provided with openings aligned with said baffles for communication with said chamber and communication means comprising another series of baiiles having aligned openings in the bottom of said conduit to allow the return How of any diverted fluid from said chamber to said conduit.

5. In a device of the class described, in combination a fluid conduit, a chamber located below said luid conduit, a series of rows of U-shaped bales having plane sides extending from the top of said conduit to the bottom thereof, said bales being spaced apart in said rows, the baffles in each row having their sides aligned with sides of adjacent baHes in the next preceding row, the bottom of said conduit being provided with openings aligned with said baliies for communication with said chamber and baflles of larger size than the preceding bafles opening toward said precedlng baffles and having aligned openings in the bottom of said conduit for allowing the return flow of any diverted Huid from said chamber to said conduit.

6. The method of separating solid parlticles from a gas, which comprises abruptly changing the direction of a horizontally flowing main stream of dust-laden gas to cause a portion thereof to be diverted downwardly to eliminate heavier solid particles, reversing .the flow of the diverted portion of gas to' an upward direction to el'ect further separation of solid particles and delivering the substantially dust free gas prtion into the main stream against the flow thereof.

7 Thermethod of separating solid particles from a flowing stream of gas, which comprises abruptly. changing the direction of v successive portions of said stream to divert ldownwardlya relatively small volume of gas containing a proportionately large volume of solid particles whereby a large proportion of the solid particles separate' vout by gravity, `and. again diverting said small volume of gas now` containing only a relatively small volume of solid particles upwardly and out against the iiow of the main stream of gas to effect further separation.

In testimony whereof kI have hereunto subscribed my name at Chicago, Cook Gounty, Illinois. y

' VERNON G. LEACH. 

